The original pattern for this backpack is here: http://www.creativeneedlemag.com/feature/feature1ja00.html but the instructions were so unclear I made an instructable. It's a great project but doesn't make sense the way it's written.
Step 1: Materials
5/8 yd. fabric (bag)
1/2 yd. lining fabric
Cut one piece of fabric 14" x 36" for bag. Cut two straps 2 1/2" x 33". Cut two pieces for bag lining 14" x 15 1/2".
Step 2: Make straps
Step 3: Sew lining to outer fabric
Step 4: Sew edges of bag
Stitch from folded edge of outer fabric up, through strap and then backstitch and stop. Skip over 1.5 inches and start sewing again along lining and around corner. Stop a few inches along the short edge of the lining (so there is a gap in the stitching at the bottom)
Step 5: Turn right side out
Step 6: Finish straps
Then turn in ends of straps (to cover up rough edges) and pin to bottom corners of bag and stitch.
Step 7: All done
Happy backpack making,